SHINBORY DENSHI HD-522 module

ENRON Floating Point Support Many manufacturers have implemented special support in their drivers to support what is commonly called the Enron version of the MODBUS protocol. In this implementation, register addresses > 7000 are presumed to be floating point values. The significance to this is that the count field now becomes a 'number of values' field. In floating point format, each value represents two words.

Configuring the Floating Point Data Transfer 

A common question when using the module as a Modbus Master is how floating point data is handled. This really depends on the slave device and how it addresses this application. Just because your application is reading/writing floating point data, does not mean that you must configure the Float Flag, Float Start, and Float Offset parameters within the module. These parameters are only used to support what is typically referred to as Enron or Daniel Modbus, where one register address must have 32 bits, or one floating point value.

With the module configured as a Master

 you only need to enable these parameters to support a write to this type of addressing (Modbus FC 6 or 16). If the slave device shows addressing as shown in Example #2, then you need not do anything with the Float Flag, Float Start parameters, as they use two Modbus addresses to represent one floating point value:Because each 32 bit REAL value is represented by two Modbus Addresses (example 47101 and 47102 represent TEMP Pump #1), then you need not set the Float Flag, or Float Start for the module for Modbus FC 6 or 16 commands being written to the slave.

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